Edward gary



No. 614,288. Patented Nov. [5, I898.

E. CARY.

THERMOSTAT.

(Application filed Sept. 16, 1897.)

(No Model.)

IN VE N 70/? UNITED STATES PATENT OFFICE.

EDWARD GARY, OF NEW YORK, N. Y., ASSIGNOR TO ALICE GILBERT AND CHARITY CARY, OF SAME PLACE.

TH ERMOSTAT.

SPECIFICATION forming part of Letters Patent No. 614,288, dated November 15, 1898. Applica filed September 16,1897. Serial No. 651,915. (No model.)

To all whom it may concern:

Be it known that I, EDWARD CARY, a citizen of the United States, and a resident of New York city, county of New York, and State of New York,have invented certain new and useful Improvements in Thermostats, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof, in which similar letters of reference indicate corresponding parts.

This invention relates to that class of thermostats or analogous apparatus which are designed to automatically indicate the overheating of bearings in engines and other I5 mechanisms by sounding an alarm; and it has special relation to an improved thermoelectric device designed for direct application and use upon the connecting-rod of an engine to indicate overheating of the crank-pin bearmg. a

The object of my invention is to provide a simple and improved mechanism of the above character which will in its general construction and arrangement be adapted for direct combination with and application to the connecting-rod of an engine and which will operate to automatically complete an electric circuit and sound an alarm during the operation of the connecting-rod whenever the crank-pin bearing becomes overheated.

In the drawings, Figure l is a side view showing the connecting-rod, crank-pin, and adjacent parts of an engine with myimproved mechanism in position. Fig. 2 is a detail side View of the crank-pin end of a connectingrod having my improvements. Fig. 3 is a detail transverse sectional view taken on the line 3 3, Fig. 2. Fig. tis a detail top or plan lew of the thermo-electric device. Fig. 5 is a detail longitudinal sectional view taken on the line 5 5, Fig. 4.

Referring to the drawings, A designates the connectingrod of an engine, B the crank, and O the crank-pin, these parts being arranged 45 and connected in any suitable or usual manner and the rear end of the connecting-rod being connected to a. sliding cross-head D, moving in a cross-head frame E, in the usual manner.

My improved thermo-electric device F comprises a strip or plate of vulcanized or hard rubber or any other suitable non-conducting substance, as shown at f, which strip or plate is surmounted by corresponding metallic strip or plate f. The plates f and f may be secured together in any suitable manner, preferably by means of pins, as shown at f, passing downwardly from the metallic top plate f into the non-conducting bottom platef.

The device F is secured directly upon the connecting-rod, preferably at the top, directly above or adjacent to the crank -pin upon bearing, in any suitable manner, preferably by means of a screw G, passing through an opening f in the insulating-plate fat the rear end of the device and into the connecting-rod, as shown in Fig. 2, this securing-screw being insulated from the metallic top plate f by cutting away the latter at the part surrounding the head of the screw, as shown at The thermo-electric device F, when secured in position upon the connecting-rod, is thus completely insulated from the latter.

Upon the connecting-rod'A, adjacent tothe device F and preferably at the front end of the latter, I secure in any suitable manner a contact-plate H, which is preferably formed by a right-angular plate having its top arm projecting over the front end of the device F, as shown in Figs. 1 and 2.

A line-wire I, comprised in an electric circuit, is connected with the metallic plate f, preferably at the rear end of the latter, and is carried rearwardly along the connectingrod A to a point near the cross-head D, this line being insulated from and connected to the connecting-rod in any suitable or desired manner. The rear end of the line-wire I has a flexible connection, as at 7;, with an arm J, carried by and insulated in any suitable manner from the cross -head D and projecting therefrom, so that it will continuously slide upon or contact with, during the movement of the cross-head and connecting-rod, a metallic plate K, carried upon and insulated from the cross-head frame E. The plate K is preferably arranged in longitudinal position at the side of the lower portion of the stationary cross-head frame E, and from one of its ends extends a line-wire L, comprised in a battery-and-bell electric circuit, the other end of said line-wire L being connected to any suitable stationary part of the cnginefor instance, as shown at L, Fig. 1.

The alarm-bell or annunciator M comprised in the electric circuit may be arranged at any suitable or desired point.

The operation and advantagesof my invention Will be readily understood by those skilled in the art to which it appertains.

mechanism will operate effectively and automatically as an alarm connection between the moving connecting-rod and stationary parts of the engine to indicate any overheating of the crank-shaft bearing at the outer end of the connecting-rod.

Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is

In an improved thernio-electric device of the class described, the combination with the connecting-rod, cross-head and frame of an engine, of a non-vibratin g thermostat secured to the connecting-rod at a point adjacent to the crank-pin bearing and insulated from said rod, an insulated line-wire connected with said thermostat and carried upon and insulated from the connecting-rod, an arm projecting from the cross-head and insulated therefrom and having a flexible connection with the wire upon the connecting rod, the contact-plate carried by the frame of the engine and insulated therefrom against which said arm bears during the sliding movement of the cross-head, a line-wire comprised in the electric circuit and extending from said contact-plate and connected with the frame or parts of the engine, and a contact-plate mounted upon the connecting-rod with relation to the thermostat and operating to complete the circuit through the frame or parts of the engine, substantially as and for the purpose set forth.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 13th day of September, 1897.

EDWARD CARY.

Witnesses:

B. MOCOMB, E. TIBBITS. 

